com.undefinedlabs.scope.deps.okhttp3.Dns Maven / Gradle / Ivy

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Scope is a APM for tests to give engineering teams unprecedented visibility into their CI process to quickly identify, troubleshoot and fix failed builds. This artifact contains dependencies for Scope.

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package com.undefinedlabs.scope.deps.okhttp3;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;

public interface Dns {
    /**
     * A DNS that uses {@link InetAddress#getAllByName} to ask the underlying operating system to
     * lookup IP addresses. Most custom {@link Dns} implementations should delegate to this instance.
     */
    Dns SYSTEM = new Dns() {
        @Override public List lookup(String hostname) throws UnknownHostException {
            if (hostname == null) throw new UnknownHostException("hostname == null");
            return Arrays.asList(InetAddress.getAllByName(hostname));
        }
    };

    /**
     * Returns the IP addresses of {@code hostname}, in the order they will be attempted by OkHttp. If
     * a connection to an address fails, OkHttp will retry the connection with the next address until
     * either a connection is made, the set of IP addresses is exhausted, or a limit is exceeded.
     */
    List lookup(String hostname) throws UnknownHostException;
}